thanx for your replys. i got my pc up & running again. i got out the motherboard manual & reset cmos.

now back to my original prob. the pc only crashes when i play games. there's no warning, it just resets & reboots back to desktop with no error message or anything. i had directx 9b & with the game i bought this weekend, i now have 9c installed. i've run a full virus check with AVG free & nothing comes up. I'm currently running macafee online scan to see if that finds anything.

PC specs are:

Abit KV7 motherboard
athlon 3000XP processor
2 x 512mb ddr 400mhz ram
geforce4 5950 256mb graphics card

i've put the latest drivers in from nvidia(june'05) to see if that made any difference.

this problem has only started in the last few weeks.

*edit* macafee hasn't found anything either!